We have Cloudflare’s setting that serves images as webp where possible. In the last two weeks, there seems to have been a regression where a small fraction of these images (maybe 2% to 5%) are sometimes getting served with a black background instead of a transparent background.
As an example: https://runescape.wiki/images/8/83/Abyssal_mystic_orb.png?45a1b has a black background (at least for most POPs I’ve tried), but if we remove image/webp from the Accept header, it serves the correct image without a black background.
Is this a known issue? Is there anything we can do to help debug it and get it fixed faster?